linux-libre-4.8.12_gnu-2: updating version

3 files changed, 96 insertions, 7 deletions

diff --git a/libre/linux-libre/PKGBUILD b/libre/linux-libre/PKGBUILD
index 5e43c9037..20a7862e9 100644
--- a/libre/linux-libre/PKGBUILD
+++ b/libre/linux-libre/PKGBUILD
@@ -11,7 +11,7 @@
 pkgbase=linux-libre         # Build stock kernel
 #pkgbase=linux-libre-custom # Build kernel with a different name
 _pkgbasever=4.8-gnu
-_pkgver=4.8.11-gnu
+_pkgver=4.8.12-gnu
 
 _replacesarchkernel=('linux%') # '%' gets replaced with _kernelname
 _replacesoldkernels=() # '%' gets replaced with _kernelname
@@ -20,7 +20,7 @@ _replacesoldmodules=() # '%' gets replaced with _kernelname
 _srcname=linux-${_pkgbasever%-*}
 _archpkgver=${_pkgver%-*}
 pkgver=${_pkgver//-/_}
-pkgrel=1
+pkgrel=2
 rcnrel=armv7-x4
 arch=('i686' 'x86_64' 'armv7h')
 url="http://linux-libre.fsfla.org/"
@@ -45,6 +45,7 @@ source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_pkgbasever}/li
         # standard config files for mkinitcpio ramdisk
         'linux.preset'
         'change-default-console-loglevel.patch'
+        'fix_race_condition_in_packet_set_ring.diff'
         '0001-usb-serial-gadget-no-TTY-hangup-on-USB-disconnect-WI.patch'
         '0002-fix-Atmel-maXTouch-touchscreen-support.patch'
         # armv7h patches
@@ -65,7 +66,7 @@ source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_pkgbasever}/li
         '0013-Revert-gpu-drm-omapdrm-dss-of-add-missing-of_node_pu.patch')
 sha256sums=('d54e0f8a27e24f3666c19b395c19dba194635db26929c89e78ffa4b2b0e8ca3a'
             'SKIP'
-            '4485fe9df1be80a5095b8662233a5c7e9a82afb1fe11f9f97475036bb94a972f'
+            '2305f73842bf41755c082900694d2f756787a9d5f7c37fd6a8ec387405e944ae'
             'SKIP'
             'bfd4a7f61febe63c880534dcb7c31c5b932dde6acf991810b41a939a93535494'
             'SKIP'
@@ -75,13 +76,14 @@ sha256sums=('d54e0f8a27e24f3666c19b395c19dba194635db26929c89e78ffa4b2b0e8ca3a'
             'SKIP'
             '6d010582398bb7b08d9b0ae111bd0d7d73ef987ed61af9e70eb6dbb99cf23974'
             '00c755903fe04ab18d7204c60e938b0c8f48b0a6b9a6c2623dc77d2e03bcb228'
-            '32b87027a055b892b1fd84a54b8ef07f0598e0e7dbb250c8b3acededcb066fb3'
+            '8ea1892dfba38b6a9d002a2504ae2e0b0551c5071fd638aaeebe0767d3354b03'
             '834bd254b56ab71d73f59b3221f056c72f559553c04718e350ab2a3e2991afe0'
             'ad6344badc91ad0630caacde83f7f9b97276f80d26a20619a87952be65492c65'
             '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
+            'ad1ee95f906f88d31fcdb9273cd08e02e8eda177449f0c98dc1bff8cbf1483c2'
             '0376bd5efa31d4e2a9d52558777cebd9f0941df8e1adab916c868bf0c05f2fc3'
             '351fd96be8cd5ebd0435c0a8a978673fc023e3b1026085e67f86d815b2285e25'
-            '2dd1dcde2100c2f1828adf28f72b9002d86270128e5fe232e4e97aa85d2b7bf5'
+            'f1e9e280b9ed8c5e12c8a6fd6dcfd638137ef6555d0dd5e28dbd8ad93ff81fe0'
             'SKIP'
             '858eac5f4aadb7a4157a36b31d101d75d841a9c58199e580201d8305356044e3'
             'eee25f5fa6e6b0fb3d5ab913521af67adf788b8613cad1b6d38711261f70646f'
@@ -147,6 +149,10 @@ prepare() {
   install -m644 -t drivers/video/logo \
     "${srcdir}/logo_linux_"{clut224.ppm,vga16.ppm,mono.pbm}
 
+  # fix a race condition that allows to gain root
+  # https://marc.info/?l=linux-netdev&m=148054660230570&w=2
+  patch -p1 -i "${srcdir}/fix_race_condition_in_packet_set_ring.diff"
+
   # add latest fixes from stable queue, if needed
   # http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
 
diff --git a/libre/linux-libre/config.armv7h b/libre/linux-libre/config.armv7h
index c967af94c..78e9e7da3 100644
--- a/libre/linux-libre/config.armv7h
+++ b/libre/linux-libre/config.armv7h
@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/arm 4.8.10-gnu-2 Kernel Configuration
+# Linux/arm 4.8.12-gnu-1 Kernel Configuration
 #
 CONFIG_ARM=y
 CONFIG_ARM_HAS_SG_CHAIN=y
@@ -114,7 +114,6 @@ CONFIG_SRCU=y
 # CONFIG_TASKS_RCU is not set
 CONFIG_RCU_STALL_COMMON=y
 # CONFIG_TREE_RCU_TRACE is not set
-# CONFIG_RCU_EXPEDITE_BOOT is not set
 CONFIG_BUILD_BIN2C=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
diff --git a/libre/linux-libre/fix_race_condition_in_packet_set_ring.diff b/libre/linux-libre/fix_race_condition_in_packet_set_ring.diff
new file mode 100644
index 000000000..12048f611
--- /dev/null
+++ b/libre/linux-libre/fix_race_condition_in_packet_set_ring.diff
@@ -0,0 +1,84 @@
+From: Philip Pettersson <philip.pettersson@gmail.com>
+
+When packet_set_ring creates a ring buffer it will initialize a
+struct timer_list if the packet version is TPACKET_V3. This value
+can then be raced by a different thread calling setsockopt to
+set the version to TPACKET_V1 before packet_set_ring has finished.
+
+This leads to a use-after-free on a function pointer in the
+struct timer_list when the socket is closed as the previously
+initialized timer will not be deleted.
+
+The bug is fixed by taking lock_sock(sk) in packet_setsockopt when
+changing the packet version while also taking the lock at the start
+of packet_set_ring.
+
+Fixes: f6fb8f100b80 ("af-packet: TPACKET_V3 flexible buffer implementation.")
+Signed-off-by: Philip Pettersson <philip.pettersson@gmail.com>
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+---
+ net/packet/af_packet.c | 18 ++++++++++++------
+ 1 file changed, 12 insertions(+), 6 deletions(-)
+
+diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
+index d2238b204691b8e4f2e3acb9bc167b553ba32d50..dd2332390c45bbff7c3fc5d259453f2e1ca352bf 100644
+--- a/net/packet/af_packet.c
++++ b/net/packet/af_packet.c
+@@ -3648,19 +3648,25 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
+ 
+ 		if (optlen != sizeof(val))
+ 			return -EINVAL;
+-		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
+-			return -EBUSY;
+ 		if (copy_from_user(&val, optval, sizeof(val)))
+ 			return -EFAULT;
+ 		switch (val) {
+ 		case TPACKET_V1:
+ 		case TPACKET_V2:
+ 		case TPACKET_V3:
+-			po->tp_version = val;
+-			return 0;
++			break;
+ 		default:
+ 			return -EINVAL;
+ 		}
++		lock_sock(sk);
++		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
++			ret = -EBUSY;
++		} else {
++			po->tp_version = val;
++			ret = 0;
++		}
++		release_sock(sk);
++		return ret;
+ 	}
+ 	case PACKET_RESERVE:
+ 	{
+@@ -4164,6 +4170,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
+ 	/* Added to avoid minimal code churn */
+ 	struct tpacket_req *req = &req_u->req;
+ 
++	lock_sock(sk);
+ 	/* Opening a Tx-ring is NOT supported in TPACKET_V3 */
+ 	if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
+ 		net_warn_ratelimited("Tx-ring is not supported.\n");
+@@ -4245,7 +4252,6 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
+ 			goto out;
+ 	}
+ 
+-	lock_sock(sk);
+ 
+ 	/* Detach socket from network */
+ 	spin_lock(&po->bind_lock);
+@@ -4294,11 +4300,11 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
+ 		if (!tx_ring)
+ 			prb_shutdown_retire_blk_timer(po, rb_queue);
+ 	}
+-	release_sock(sk);
+ 
+ 	if (pg_vec)
+ 		free_pg_vec(pg_vec, order, req->tp_block_nr);
+ out:
++	release_sock(sk);
+ 	return err;
+ }